<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>变量</title>
</head>
<body>
  <script>
    var s = '我说："今天\n天气真\\不错！"';
    console.log(s);
    console.log(isNaN('haha' + 100));
    var a;
    console.log(a);
    var b = [[1, 2], [1, 3], [1, 4], [1, 5]];
    console.log(b[1][1]);
    var c = {
      name: '刘定卡岸',
      age: 20
    }
    console.log(c.name);
    console.log(111 + '00');
  </script>
</body>
</html>